As a R&D engineer, your task is to design a robotic solution to automate the concrete surface polishing task in the modular building construction site based on following requirements: (i) The robot needs to have the mobility and compact footprint to move around in the assembled residential unit and in between different units with tight space and corridors in between 1 to 2 meters wide. The surface of the building is unpaved concrete floor with sufficient loading capacity as shown in Figure 1. (ii) The robot needs to have an arm or mechanism to carry the polishing tool weighing around 5 to 8 kg. The arm or the mechanism needs to be dexterous enough to handle the corners, columns, beams and joints between the walls and the ceiling. The robot needs to do polishing job for the walls from 0 to 3 m in height and the ceiling at 3 m in height. (iii) The robot needs to have a perception system to scan and recognize the surfaces to determine the polishing patterns generated by the robot. (iv) The robot needs to have a navigation system so that it can stop at a location and do the polishing work. After completion, the robot will move to the next location to repeat the polishing work. The locations can be determined by the human operator during the setup stage prior to the polishing. The operator does not need to be around the robot all the time. (v) To perform the polishing job neatly, the polishing robot needs to have a vacuum cleaner to suck in the dust produced during the polishing process like the manual process shown in Figure 1(c). Determine important attributes of a robot system that can meet the above requirements: (1) Determine a suitable type of robot manipulator for concrete polishing task. (5 marks) (2) Determine a suitable type of mobile robot base design that meets the locomotion requirement in the modular building units in the stated construction environment. (5 marks) detection of (5 marks) (4) Determine the advantages and disadvantages for this robotic system based on both AC and DC power sources, such as handling of electric cables, batteries. and other factors. (5 marks) (3) Determine suitable sensors for surface geometry identification, polishing forces and navigation in the room. State the reasons. (Note: Please write your answers concise and to the point.)